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Truly Distributed Fiber Vibration Sensor Using Pulse Base BOTDA With Wide Dynamic Range

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4 Author(s)
Qingsong Cui ; Department of Civil and Environmental Engeering, Lehigh Univeristy, Bethlehem, PA, USA ; Sibel Pamukcu ; Wen Xiao ; Mesut Pervizpour

We report on what we believe to be the first truly distributed fiber vibration sensor based on pulse base Brillouin optical time-domain analysis (BOTDA). The pulse base approach is used to realize one-end one-laser simplification of the BOTDA system, in which the modulated pulse creates the probe wave and interacts with the pulse pump. Short pulse ( 10 ns) is used to enhance the dynamic range for the sensed object. A signal acquisition system with a 1-GHz sampling rate and 2-kHz trigger rate is employed to measure the truly distributed vibrations along the sensing fiber. With 6.25-ns pulsewidth, 160-MHz dynamic range is verified and different vibrations with 0-, 1.4-, and 2.4-Hz frequency components are distinguished in a 168-m sensing range. The experimental results demonstrate that this proposed sensor may be applicable for distributed dynamic measurements of large structural components.

Published in:

IEEE Photonics Technology Letters  (Volume:23 ,  Issue: 24 )